Surging Tach
 

As it appears that winter is skipping the Pacific Northwest I flew up to Vancouver, WA this past weekend and awoke my baby form hibernation, replaced the 5 year old batteries, fixed the "always on brake lights (as a result of pre-hibernation master brake cylinder replacement) and she ran flawlessly the 300 mile trip down to Klamath Falls, OR. This morning I started her up, though she was reluctant at first, and then she developed a peculiar problem. The tach is surging/fluctuating at all RPM's and falls to zero when I depress the clutch. Anyone have an idea on where to start looking, or better yet the always elusive quick, easy, and cheap fix?

All thoughts welcome.:)

points are the usual problem. barely opening, or dirty/burnt. the next reason is the battery loosing voltage from not being charged. next, the tach itself.

Thanks John. I will check the points straight away. The batteries are new OEM's from the dealer and the alternator light is not staying on -- so I am assuming that the batt's are getting their required juice.